Display screen or portion thereof with transitional graphical user interface



FIG. 1 is the first image of a first embodiment in a sequence of adisplay screen or portion thereof with transitional graphical userinterface showing our new design;

FIG. 2 is the second image thereof;

FIG. 3 is the first image of a second embodiment in a sequence of adisplay screen or portion thereof with transitional graphical userinterface showing our new design;

FIG. 4 is the second image thereof;

FIG. 5 is the first image of a third embodiment in a sequence of adisplay screen or portion thereof with transitional graphical userinterface showing our new design;

FIG. 6 is the second image thereof;

FIG. 7 is the first image of a fourth embodiment in a sequence of adisplay screen or portion thereof with transitional graphical userinterface showing our new design; and,

FIG. 8 is the second image thereof.

The outermost broken line in the figures depicting the display screen orportion thereof is for environmental purposes only and forms no part ofthe claimed design.

The remaining broken lines in the figures show portions of thetransitional graphical user interface which form no part of the claimeddesign.

The appearance of the transitional image sequentially transitionsbetween the images shown in FIGS. 1 and 2, FIGS. 3 and 4, FIGS. 5 and 6,and FIGS. 7 and 8, respectively. The process or period in which oneimage transitions to another image forms no part of the claimed design.

CLAIM We claim the ornamental design for a display screen or portionthereof with transitional graphical user interface, as shown anddescribed.